This is an intermittent issue. I load a website, scroll down, and Chrome automatically reduces zoom from 100% to 90%. I click Ctrl+0 to set it back to 100%. I reload the page, scroll up - the zoom goes to 110%.
This has been going on for a while on multiple computers, using the latest Chrome version.
Are all of you using a program called KatMouse or WizMouse?
I had the same problem, and it looks like WizMouse thinks Chrome doesn't have scroll capabilities. I'm saying that since all works fine if I deactivate 'Enable mouse wheel for applications withough mouse wheel support".
This should only occur when your Ctrl key is pressed down. Chrome must think this is the case, so I am going to suggest your ensure your keyboard key is not stuck down in some way. Maybe press the Alt and Del keys and see if that brings up the switch user screen or whatever (depending on your OS)
If you are on a laptop it is possible you have activated your trackpad zoom.
Google forum has a post on this issue which might be of some help to you. Find it here
If you are using a ThinkPad or a TrackPoint (with the small red button/joystick/trackpoint between the g and h keys) keyboard, update the keyboard driver. Then, for Windows 10, go into
Mouse Settings -> Additional Mouse Options
and you'll see an external keyboard tab. Disable "Thinkpad preferred scrolling" and chrome should once again behave normally.
